Re: Re: Flat Short of MEMORY_BLOCK

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Berend de Boer <[email protected]> writes:

> I can just raise the iterations to enhance it. I did a couple of runs,
> just copied the first two, and indeed these two look like jitter. Most
> of the time the array was a bit faster though, so that's why I didn't
> look carefully.
>
> I'll have a look at the generated assembly code with -O3.

- -O3 produces different code (don't ask me), but with -O2 the assember
 code looks the same to me. This is the assember code where the buffer
 has become a global variable.


test0 is the routine with the assignment, test1 is the memcpy routine.


	.file	"test.c"
	.version	"01.01"
gcc2_compiled.:
	.section	.rodata
.LC0:
	.byte	 0x61,0x72,0x72,0x61,0x79,0x20,0x25,0x64,0xa,0x0
.LC1:
	.byte	 0x6d,0x65,0x6d,0x63,0x70,0x79,0x20,0x25,0x64,0xa
	.byte	 0x0
.text
	.p2align 2,0x90
.globl main
		.type		 main,@function
main:
	pushl %ebp
	movl %esp,%ebp
	subl $44,%esp
	pushl %edi
	pushl %esi
	pushl %ebx
	addl $-12,%esp
	leal -16(%ebp),%ebx
	pushl %ebx
	call times
	addl $16,%esp
	xorl %eax,%eax
	leal -32(%ebp),%edi
	movl $buffer,%esi
	.p2align 2,0x90
.L27:
	leal 1(%eax),%edx
	movl $99999,%ecx
	leal 99999(%esi),%eax
	.p2align 2,0x90
.L30:
	movb $12,(%eax)
	decl %eax
	decl %ecx
	jns .L30
	movl %edx,%eax
	cmpl $4999,%eax
	jle .L27
	addl $-12,%esp
	pushl %edi
	call times
	addl $-8,%esp
	movl -16(%ebp),%eax
	movl -32(%ebp),%edx
	subl %eax,%edx
	movl %edx,%eax
	pushl %eax
	pushl $.LC0
	call printf
	addl $32,%esp
	addl $-12,%esp
	pushl %ebx
	call times
	addl $16,%esp
	xorl %eax,%eax
	movb $12,%bl
	movl $buffer,%esi
	.p2align 2,0x90
.L38:
	leal 1(%eax),%edx
	movl $99999,%ecx
	leal 99999(%esi),%eax
	.p2align 2,0x90
.L41:
	movb %bl,(%eax)
	decl %eax
	decl %ecx
	jns .L41
	movl %edx,%eax
	cmpl $4999,%eax
	jle .L38
	addl $-12,%esp
	pushl %edi
	call times
	addl $-8,%esp
	movl -16(%ebp),%eax
	movl -32(%ebp),%edx
	subl %eax,%edx
	movl %edx,%eax
	pushl %eax
	pushl $.LC1
	call printf
	leal -56(%ebp),%esp
	popl %ebx
	popl %esi
	popl %edi
	leave
	ret
.Lfe1:
		.size		 main,.Lfe1-main
	.comm	buffer,100000,32
	.p2align 2,0x90
.globl test0
		.type		 test0,@function
test0:
	pushl %ebp
	movl %esp,%ebp
	pushl %ebx
	xorl %eax,%eax
	movl $buffer,%ebx
	.p2align 2,0x90
.L6:
	leal 1(%eax),%edx
	movl $99999,%ecx
	leal 99999(%ebx),%eax
	.p2align 2,0x90
.L10:
	movb $12,(%eax)
	decl %eax
	decl %ecx
	jns .L10
	movl %edx,%eax
	cmpl $4999,%eax
	jle .L6
	popl %ebx
	leave
	ret
.Lfe2:
		.size		 test0,.Lfe2-test0
	.p2align 2,0x90
.globl test1
		.type		 test1,@function
test1:
	pushl %ebp
	movl %esp,%ebp
	pushl %esi
	pushl %ebx
	xorl %eax,%eax
	movl $buffer,%esi
	movb $12,%bl
	.p2align 2,0x90
.L17:
	leal 1(%eax),%edx
	movl $99999,%ecx
	leal 99999(%esi),%eax
	.p2align 2,0x90
.L21:
	movb %bl,(%eax)
	decl %eax
	decl %ecx
	jns .L21
	movl %edx,%eax
	cmpl $4999,%eax
	jle .L17
	popl %ebx
	popl %esi
	leave
	ret
.Lfe3:
		.size		 test1,.Lfe3-test1
	.ident	"GCC: (GNU) c 2.95.4 20020320 [FreeBSD]"


- -- 
Live long and prosper,

Berend de Boer
(PGP public key: http://www.pobox.com/~berend/berend-public-key.txt)
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